This really depends on the product and its use
Assessment of Gene Expression by qPCR Epitalon (20, 40, and 60 ng/ml) was added to ARPE-19 cells (500,000 cells/well) exposed to high concentrations of glucose (HG, 35 mM) for 2472 h
GHK-Cu, a naturally occurring copper-binding tripeptide, excels in skin rejuvenation, collagen remodeling, and topical wound healing through copper-dependent enzyme activation
D.Canadian Critical Care Translational Biology Group (2014)
All study participants were randomly assigned to an experimental treatment group that received subcutaneous injection of cagrilintide, once-weekly, in doses of either 0.3, 0.6, 1.2, 2.4, or 4.5 mg, as well as a one-daily 3.0 mg dose of liraglutide, and a volume matched placebo for control purposes